Valve



@alienated l,

sAMUnIQr. Marsman, or cnaiatnsrongfwnsir vIneINIA.

l VALVE.

npp1icati0n ined Apriii, 192i. serial no. 457,636.

To 'all LU/wm, tt'may concern; n r I Be it known that l, SAMUEL T. MCLELLAN,

` a citizen of the United States, residing at Charleston, in the county oflanawha', `State orlest Virginia, have invented certain new and useful improvements in "Valves,

and l do hereby Ydeclarethe vfollowing to be a full, clear, andexact description of the invention, such as will enable others- One object of the invention is to provide a valve oi' this character in lwhich the valve head can be removed without danger of and the said valve rotated on its seat to grind the same toits seat.

Another object is to provide a valve of this character wherein are disposed two valve lheads each of which is unseated vwhen the other is seated, by the seating action of the other.

Other objects and advantages will be apparent from the following description when taken in connection with the accompanying drawing.

- In the drawing:

Figure 1 is a side elevation of a valve made in accordance with the invention.

Figure 2 is a vertical longitudinal central sectional view through the valve casing, the valve heads being 4shown in elevation, the valve being shown in open position, ior draining purposes.

Figure 3 is a view similar to that of F igure 2, but showing the valve operating stem removed, and. the valve in position for grinding.

Figure 4 is a vertical transverse sectional r view taken on the line 4,-4 oi' Figure 2.

'Figure 5 is a vertical transverse sectional View taken on the line 5 5 of Figure 2. y

Referring particularly to the accompanying drawing, represents the valve easing in which is formed the chamber 11, adjacent one end. Extending from one end of this chamber, through the adjacent end of the casing, is a threaded bore 12, in which is screwed the threaded operating stem 13, of the valve. The outer end of VVtured plugor cap 19. f

escape of steamer hot Water from the boiler,

this steinvr is provided with the usual hand wheel 14. l l j Inthe inner end of the'chamber 11 there is formed aeonical seat 15,*and extending from the inner end `of this seat to'apoint adjacent thel other end of the casing,y is a small bore 16, the'same terminating at said other end ofv the casing, in the -finner end of a similar conical valve seat 17. The' outeror'wider end of the latter seat 17 is,extended through ythe end'of the casing in an internally threaded bore 18 in which'is c'received the removable and centrally papervThe Ainner end of the operating vstem 13 is formed with a central longitudinal cavity 13, as clearly seen in the 'sectional view A Figure 2, wherein the inner end oi' the said stem is partially broken away.

Disposed on the seat 15 is a valve head 2O which is termed the gauge valve having a rearwardly extending stem 21 which enters the cavity 13 of the operating-stem 13.

Screwed into the other or smaller end of the valve head 20 is a stem 22 which extends longitudinally in the bore 16. Disposed against the seat 17 is a similar valve head 23 which is termed the check valve, having a rearwardly extending stem 24, and having the short stem 25 which extends into the bore 16 toward and into contact with the adjacent end of the stem 22 of the valve head 20. The depth of the cavity 13 is such that when the stem 13 is screwed into the casing to its Jfull extent, the end of the stem 21 will engage with the inner end of the cavity `and the valve 2() be thus driven against the seat 15.l At the same time the stem 22 will engage the stem 25 and push the valve 23 from its seat.A The vrelative lengths of the stems 22 and 25 are such that both valves may be unseated at they same time, and when the stem 13 is turnedvoutwardly, 'the pressure from ywithin the boiler (notshown) will operate to forcethe valve 23 against its Seat, with the result that its y stem 25 willv push the stem 22, and force the 2O will he driven completely away from its seat 15. rfhe valve 20, is then removed from the casing, and the sten22 unscrewed from Ithe valve. rlhe valve 20 is then restored to its seat l5, after which ascrew driver `(not shown) may be engaged in the notch 2l of the stein 2l, and the valve rotated hack and forth against the seat l5, until the valve and seat are properly ground. This arrangement is clearly seen in Figure 3. rVl/'hen the valve 20 is removed lthe pressure of the boiler holds the valve 23 tightly against the seat 17, so that danger of esca-ping water or steam is efectively prevented.

By reference to Figures 4 and 5, it will heseen that the cross sectional areal of the.

portion ofy the bore 1G which` is unoccupied hy the stems 22 and 25, 1s` greater than the cross sectional area of the opening between .the seat 1 5 and the valve head 20, when `said valve is completely unseated. This provides a constrieted spae between the valve head and its seat which will bey kept clear of any accumulations of mud,-or sediment, by the Yforce exerted by the water or steam flowing through the larger area or the bore.

What is claimed is: l

A gauge cock having its casing provided with oppositely disposed inner and outer valve seats, oppositely seating check and gauge valves for said seats and provided with positioning stems terminally contacting to provide a selective seating of the valves, the gauge valve having an outwardly directed regrinding stern and having its positioning stem detachahly secured thereto, and a valve operating stein having an inner` terminal bore for receiving the re* grinding' stein of the gauge valve for swivel engagement therewith.

ln testimony whereof, I aflix my signat ture, in the presence of two witnesses.

SAMUEL T. MCLELLAN.

Witnesses:

CLAUDE L. SMITH, kSEHRLEY BRADFORD. 

